Hundreds took part in the march against the double bunking arrangements.

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Hundreds of workers on Chevron's offshore Gorgon Project have participated in a march protesting against onsite bunk bed arrangements.

Workers on Barrow Island off the Pilbara coast are repeatedly being offered $125 a day to share a double bunk bed with an employee working the opposite day or night shift.

On Sunday they made their opposition to the offer known.

Chevron says the current arrangement is voluntary but the Construction, Forestry, Mining and Energy Union says workers feel pressured into accepting it.

The CFMEU's state secretary Mick Buchan says frustration is high.

"Our members are telling us some horror stories where if you refuse to bunk bed, you're going to be seen as being against project timelines, you need to give it a go," he said.

"The pressure is on them to agree to the bunk bedding scenario."

Mr Buchan says Chevron should be offering alternatives.

"It may be voluntary but those that are in bunk beds are going to be on the project longer," he said.

"Chevron needs to sit down with unions and come up with alternative accommodation measures or whatever they need to do to be able to build this project properly, safely, and with good morale or whatever goes with it on the job."

In a statement, Chevron says there is a shortage of accommodation.

"Due to a current shortage, additional beds are required on Barrow Island," the statement said.

"A proportion of rooms at the Project's Fly Camp are being converted to dual occupancy, with these rooms being occupied by two people on opposite shifts."

Chevron says only some of the rooms have bunk beds, and it is a necessary measure to cope with the lack of accommodation space on Barrow Island in peak construction times.

It also says a number of workers have already elected to move into shared accommodation and receive extra payments for doing so.